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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6228) Fixup daughters twice cause daughter region assigned twice
Date Wed, 27 Jun 2012 11:12:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ramkrishna.s.vasudevan updated HBASE-6228:
------------------------------------------

    Attachment: HBASE-6228v4.patch
    
> Fixup daughters twice  cause daughter region assigned twice
> -----------------------------------------------------------
>
>                 Key: HBASE-6228
>                 URL: https://issues.apache.org/jira/browse/HBASE-6228
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>             Fix For: 0.96.0
>
>         Attachments: HBASE-6228.patch, HBASE-6228v2.patch, HBASE-6228v2.patch, HBASE-6228v3.patch,
HBASE-6228v4.patch
>
>
> First, how fixup daughters twice happen?
> 1.we will fixupDaughters at the last of HMaster#finishInitialization
> 2.ServerShutdownHandler will fixupDaughters when reassigning region through ServerShutdownHandler#processDeadRegion
> When fixupDaughters, we will added daughters to .META., but it coudn't prevent the above
case, because FindDaughterVisitor.
> The detail is as the following:
> Suppose region A is a splitted parent region, and its daughter region B is missing
> 1.First, ServerShutdownHander thread fixup daughter, so add daughter region B to .META.
with serverName=null, and assign the daughter.
> 2.Then, Master's initialization thread will also find the daughter region B is missing
and assign it. It is because FindDaughterVisitor consider daughter is missing if its serverName=null

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